The shell bucket of an excavator (also known as a shell bucket, grab bucket or shell bucket) is an accessory designed for excavators. Its appearance and movement are similar to shells. The shell body is opened and merged by the extension of the cylinder to grab materials and complete loading, unloading, excavation and other operations.
Structural features
Components
Bucket body: The shape is similar to a shell, consisting of two symmetrical buckets (shell-shaped grab bucket), or three or more jaw plates (orange-segment grab bucket, suitable for large pieces of ore, scrap steel, etc.).
Opening and closing mechanism: Driven by hydraulic or mechanical means to control the opening and merging of the shell body.
Bucket ears and bucket teeth: Connect the excavator mechanical arm, and some models are equipped with replaceable bucket teeth to adapt to different materials.
Hydraulic system:
Without hydraulic rotation: directly borrow the oil circuit of the excavator bucket cylinder, without additional hydraulic valve blocks and pipelines.
With hydraulic rotation: hydraulic valve blocks and pipelines need to be added to achieve 360-degree rotation and improve operational flexibility.
Cylinder protection device: equipped with piston protection device to extend the service life of the cylinder.
Type classification
By the number of jaws: double jaws (shell-shaped bucket, commonly used) and multi-jaws (orange-segment bucket, stronger gripping force).
By function: hydraulic rotary type (flexible operation) and mechanical drive type (simple structure, low cost).
By shape: shell-shaped grab bucket (suitable for loose materials) and scissor grab bucket (scissor-like structure, the gripping force increases with closing, suitable for cleaning material yards).
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